[vtkusers] Direct access to the array of vtkImageData

[Dirk Kolb]

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Hi,

thanks for the fast reply. I tested your advise but without success.

I used the

image->SetScalarComponentFromDouble(idxFreq,idxTime,0,0,value)

method, which worked without any problems. I tried the method

double* data =	(double*)(image->GetScalarPointer(idxFreq,idxTime,0))

in order to check the functionality of GetScalarPointer. The results
was, that data consisted of a non initalized value, e.g. -212121412. So
is there something wrong with the assumption, that "data[0]" should be
equal to "value"?

Many thanks,
Dirk

Michael Jackson schrieb:
> vtkImageData* image = vtkImageData::New();
> // Set the data type, allocate  all the data and stuff like that
> 
> double* data = (double*)(image->GetScalarPointer());
> 
> untested but should work.
> _________________________________________________________
> Mike Jackson                  mike.jackson at bluequartz.net
> BlueQuartz Software                    www.bluequartz.net
> Principal Software Engineer                  Dayton, Ohio
> 
> 
> 
> On Mar 11, 2009, at 11:23 AM, Dirk Kolb wrote:
> 
> Hello,
> 
> I hope this is the right forum for my question. This is my first time
> with VTK.
> 
> I need some hints for the following problem:
> 
> I implemented a viewer for the presentation of spectral data. Therefore
> I used the vtkImageViewer together with the vtkImageData. I get the
> spectral data in form of a double valued matrix (1000,4096). The content
> of the matrix and also of the vtkImageData is time dependend. This means
> the content of  e.g. the 100th line is in the next time step the content
> of the 99th line and so on. The first line of the array is dropped and a
> new line is pushed back.
> 
> Is there a possibility for a fast implemtation? In my opinion I need the
> direct access to the data array of a vtkImageData?
> 
> Thanks in advance,
> 
> Dirk
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